[PATCH 0/2] riscv: vdso: Do not use LTO for the vDSO

[PATCH 0/2] riscv: vdso: Do not use LTO for the vDSO

[Thomas Weißschuh]

With LTO enabled the compiler assumes that the vDSO functions are not
used and optimizes them away completely.

Disable LTO for the vDSO, as these functions are hand-optimized anyways.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
Thomas Weißschuh (2):
      riscv: vdso: Do not use LTO for the vDSO
      riscv: vdso: Simplify cflags remove logic

 arch/riscv/kernel/vdso/Makefile | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
---
base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482
change-id: 20260630-riscv-vdso-lto-2a5c6f021162

Best regards,
--  
Thomas Weißschuh (Schneider Electric) <thomas.weissschuh@linutronix.de>


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[PATCH 0/2] riscv: vdso: Do not use LTO for the vDSO

[Thomas Weißschuh]

With LTO enabled the compiler assumes that the vDSO functions are not
used and optimizes them away completely.

Disable LTO for the vDSO, as these functions are hand-optimized anyways.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
Thomas Weißschuh (2):
      riscv: vdso: Do not use LTO for the vDSO
      riscv: vdso: Simplify cflags remove logic

 arch/riscv/kernel/vdso/Makefile | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)
---
base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482
change-id: 20260630-riscv-vdso-lto-2a5c6f021162

Best regards,
--  
Thomas Weißschuh (Schneider Electric) <thomas.weissschuh@linutronix.de>

[PATCH 1/2] riscv: vdso: Do not use LTO for the vDSO

[Thomas Weißschuh]

With LTO enabled the compiler assumes that the vDSO functions are not
used and optimizes them away completely. Currently this happens to
__vdso_clock_getres(), __vdso_clock_gettime(), __vdso_getrandom(),
__vdso_gettimeofday() and __vdso_riscv_hwprobe().

Disable LTO for the vDSO, as these functions are hand-optimized anyways.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202606301855.WvkSC4kD-lkp@intel.com/
Fixes: 021d23428bdb ("RISC-V: build: Allow LTO to be selected")
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 arch/riscv/kernel/vdso/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
index a842dc034571..43ee881f6c6f 100644
--- a/arch/riscv/kernel/vdso/Makefile
+++ b/arch/riscv/kernel/vdso/Makefile
@@ -69,9 +69,9 @@ CPPFLAGS_$(vdso_lds) += -DHAS_VGETTIMEOFDAY
 endif
 
 # Disable -pg to prevent insert call site
-CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
-CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
-CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
+CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
+CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
+CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
 
 # Force dependency
 $(obj)/$(vdso_o): $(obj)/$(vdso_so)

-- 
2.55.0


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[PATCH 1/2] riscv: vdso: Do not use LTO for the vDSO

[Thomas Weißschuh]

With LTO enabled the compiler assumes that the vDSO functions are not
used and optimizes them away completely. Currently this happens to
__vdso_clock_getres(), __vdso_clock_gettime(), __vdso_getrandom(),
__vdso_gettimeofday() and __vdso_riscv_hwprobe().

Disable LTO for the vDSO, as these functions are hand-optimized anyways.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202606301855.WvkSC4kD-lkp@intel.com/
Fixes: 021d23428bdb ("RISC-V: build: Allow LTO to be selected")
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 arch/riscv/kernel/vdso/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
index a842dc034571..43ee881f6c6f 100644
--- a/arch/riscv/kernel/vdso/Makefile
+++ b/arch/riscv/kernel/vdso/Makefile
@@ -69,9 +69,9 @@ CPPFLAGS_$(vdso_lds) += -DHAS_VGETTIMEOFDAY
 endif
 
 # Disable -pg to prevent insert call site
-CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
-CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
-CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
+CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
+CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
+CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
 
 # Force dependency
 $(obj)/$(vdso_o): $(obj)/$(vdso_so)

-- 
2.55.0

[PATCH 2/2] riscv: vdso: Simplify cflags remove logic

[Thomas Weißschuh]

Listing all flags for each object file is tedious and error-prone.

Replace it with a simpler solution.

Link: https://lore.kernel.org/all/20260630135316-f26f0e0f-c08c-4d4d-9963-10f9985a7689@linutronix.de/
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 arch/riscv/kernel/vdso/Makefile | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
index 43ee881f6c6f..8dbf2532a573 100644
--- a/arch/riscv/kernel/vdso/Makefile
+++ b/arch/riscv/kernel/vdso/Makefile
@@ -41,6 +41,8 @@ ccflags-y += $(CFI_FULL)
 asflags-y += $(KBUILD_BASE_ISA)$(CFI_MARCH)
 asflags-y += $(CFI_FULL)
 
+ccflags-remove-y += $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
+
 ifneq ($(c-gettimeofday-y),)
   CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)
 endif
@@ -68,11 +70,6 @@ ifneq ($(filter vgettimeofday, $(vdso-syms)),)
 CPPFLAGS_$(vdso_lds) += -DHAS_VGETTIMEOFDAY
 endif
 
-# Disable -pg to prevent insert call site
-CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
-CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
-CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
-
 # Force dependency
 $(obj)/$(vdso_o): $(obj)/$(vdso_so)
 

-- 
2.55.0


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[PATCH 2/2] riscv: vdso: Simplify cflags remove logic

[Thomas Weißschuh]

Listing all flags for each object file is tedious and error-prone.

Replace it with a simpler solution.

Link: https://lore.kernel.org/all/20260630135316-f26f0e0f-c08c-4d4d-9963-10f9985a7689@linutronix.de/
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 arch/riscv/kernel/vdso/Makefile | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
index 43ee881f6c6f..8dbf2532a573 100644
--- a/arch/riscv/kernel/vdso/Makefile
+++ b/arch/riscv/kernel/vdso/Makefile
@@ -41,6 +41,8 @@ ccflags-y += $(CFI_FULL)
 asflags-y += $(KBUILD_BASE_ISA)$(CFI_MARCH)
 asflags-y += $(CFI_FULL)
 
+ccflags-remove-y += $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
+
 ifneq ($(c-gettimeofday-y),)
   CFLAGS_vgettimeofday.o += -fPIC -include $(c-gettimeofday-y)
 endif
@@ -68,11 +70,6 @@ ifneq ($(filter vgettimeofday, $(vdso-syms)),)
 CPPFLAGS_$(vdso_lds) += -DHAS_VGETTIMEOFDAY
 endif
 
-# Disable -pg to prevent insert call site
-CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
-CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
-CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
-
 # Force dependency
 $(obj)/$(vdso_o): $(obj)/$(vdso_so)
 

-- 
2.55.0

Re: [PATCH 0/2] riscv: vdso: Do not use LTO for the vDSO

[Nam Cao]

Thomas Weißschuh <thomas.weissschuh@linutronix.de> writes:
> With LTO enabled the compiler assumes that the vDSO functions are not
> used and optimizes them away completely.
>
> Disable LTO for the vDSO, as these functions are hand-optimized anyways.
>
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Reviewed-by: Nam Cao <namcao@linutronix.de>

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Re: [PATCH 0/2] riscv: vdso: Do not use LTO for the vDSO

[Nam Cao]

Thomas Weißschuh <thomas.weissschuh@linutronix.de> writes:
> With LTO enabled the compiler assumes that the vDSO functions are not
> used and optimizes them away completely.
>
> Disable LTO for the vDSO, as these functions are hand-optimized anyways.
>
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>

Reviewed-by: Nam Cao <namcao@linutronix.de>

Re: [PATCH 1/2] riscv: vdso: Do not use LTO for the vDSO

[Nathan Chancellor]

On Wed, Jul 01, 2026 at 11:21:22AM +0200, Thomas Weißschuh wrote:
> With LTO enabled the compiler assumes that the vDSO functions are not
> used and optimizes them away completely. Currently this happens to
> __vdso_clock_getres(), __vdso_clock_gettime(), __vdso_getrandom(),
> __vdso_gettimeofday() and __vdso_riscv_hwprobe().
> 
> Disable LTO for the vDSO, as these functions are hand-optimized anyways.
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202606301855.WvkSC4kD-lkp@intel.com/

While this change seems correct, is this really the fix for that report?
It seems like that error happens in clang but I would expect this sort
of issue to only appear once LTO has run through ld.lld?

> Fixes: 021d23428bdb ("RISC-V: build: Allow LTO to be selected")
> Cc: stable@vger.kernel.org
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
> ---
>  arch/riscv/kernel/vdso/Makefile | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
> index a842dc034571..43ee881f6c6f 100644
> --- a/arch/riscv/kernel/vdso/Makefile
> +++ b/arch/riscv/kernel/vdso/Makefile
> @@ -69,9 +69,9 @@ CPPFLAGS_$(vdso_lds) += -DHAS_VGETTIMEOFDAY
>  endif
>  
>  # Disable -pg to prevent insert call site
> -CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
> -CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
> -CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
> +CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
> +CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
> +CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
>  
>  # Force dependency
>  $(obj)/$(vdso_o): $(obj)/$(vdso_so)
> 
> -- 
> 2.55.0
> 

-- 
Cheers,
Nathan

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Re: [PATCH 1/2] riscv: vdso: Do not use LTO for the vDSO

[Nathan Chancellor]

On Wed, Jul 01, 2026 at 11:21:22AM +0200, Thomas Weißschuh wrote:
> With LTO enabled the compiler assumes that the vDSO functions are not
> used and optimizes them away completely. Currently this happens to
> __vdso_clock_getres(), __vdso_clock_gettime(), __vdso_getrandom(),
> __vdso_gettimeofday() and __vdso_riscv_hwprobe().
> 
> Disable LTO for the vDSO, as these functions are hand-optimized anyways.
> 
> Reported-by: kernel test robot <lkp@intel.com>
> Closes: https://lore.kernel.org/oe-kbuild-all/202606301855.WvkSC4kD-lkp@intel.com/

While this change seems correct, is this really the fix for that report?
It seems like that error happens in clang but I would expect this sort
of issue to only appear once LTO has run through ld.lld?

> Fixes: 021d23428bdb ("RISC-V: build: Allow LTO to be selected")
> Cc: stable@vger.kernel.org
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
> ---
>  arch/riscv/kernel/vdso/Makefile | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
> index a842dc034571..43ee881f6c6f 100644
> --- a/arch/riscv/kernel/vdso/Makefile
> +++ b/arch/riscv/kernel/vdso/Makefile
> @@ -69,9 +69,9 @@ CPPFLAGS_$(vdso_lds) += -DHAS_VGETTIMEOFDAY
>  endif
>  
>  # Disable -pg to prevent insert call site
> -CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
> -CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
> -CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
> +CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
> +CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
> +CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
>  
>  # Force dependency
>  $(obj)/$(vdso_o): $(obj)/$(vdso_so)
> 
> -- 
> 2.55.0
> 

-- 
Cheers,
Nathan

Re: [PATCH 1/2] riscv: vdso: Do not use LTO for the vDSO

[Thomas Weißschuh]

On Mon, Jul 06, 2026 at 02:01:58PM -0700, Nathan Chancellor wrote:
> On Wed, Jul 01, 2026 at 11:21:22AM +0200, Thomas Weißschuh wrote:
> > With LTO enabled the compiler assumes that the vDSO functions are not
> > used and optimizes them away completely. Currently this happens to
> > __vdso_clock_getres(), __vdso_clock_gettime(), __vdso_getrandom(),
> > __vdso_gettimeofday() and __vdso_riscv_hwprobe().
> > 
> > Disable LTO for the vDSO, as these functions are hand-optimized anyways.
> > 
> > Reported-by: kernel test robot <lkp@intel.com>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202606301855.WvkSC4kD-lkp@intel.com/
> 
> While this change seems correct, is this really the fix for that report?
> It seems like that error happens in clang but I would expect this sort
> of issue to only appear once LTO has run through ld.lld?

At this point the vDSO userspace library has already run through ld.lld.
That has optimized away the futex symbols, which means their offsets are not
defined when building the regular vDSO *kernel* code.

> > Fixes: 021d23428bdb ("RISC-V: build: Allow LTO to be selected")
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
> > ---
> >  arch/riscv/kernel/vdso/Makefile | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
> > index a842dc034571..43ee881f6c6f 100644
> > --- a/arch/riscv/kernel/vdso/Makefile
> > +++ b/arch/riscv/kernel/vdso/Makefile
> > @@ -69,9 +69,9 @@ CPPFLAGS_$(vdso_lds) += -DHAS_VGETTIMEOFDAY
> >  endif
> >  
> >  # Disable -pg to prevent insert call site
> > -CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
> > -CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
> > -CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
> > +CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
> > +CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
> > +CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
> >  
> >  # Force dependency
> >  $(obj)/$(vdso_o): $(obj)/$(vdso_so)
> > 
> > -- 
> > 2.55.0
> > 
> 
> -- 
> Cheers,
> Nathan

Re: [PATCH 1/2] riscv: vdso: Do not use LTO for the vDSO

[Thomas Weißschuh]

On Mon, Jul 06, 2026 at 02:01:58PM -0700, Nathan Chancellor wrote:
> On Wed, Jul 01, 2026 at 11:21:22AM +0200, Thomas Weißschuh wrote:
> > With LTO enabled the compiler assumes that the vDSO functions are not
> > used and optimizes them away completely. Currently this happens to
> > __vdso_clock_getres(), __vdso_clock_gettime(), __vdso_getrandom(),
> > __vdso_gettimeofday() and __vdso_riscv_hwprobe().
> > 
> > Disable LTO for the vDSO, as these functions are hand-optimized anyways.
> > 
> > Reported-by: kernel test robot <lkp@intel.com>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202606301855.WvkSC4kD-lkp@intel.com/
> 
> While this change seems correct, is this really the fix for that report?
> It seems like that error happens in clang but I would expect this sort
> of issue to only appear once LTO has run through ld.lld?

At this point the vDSO userspace library has already run through ld.lld.
That has optimized away the futex symbols, which means their offsets are not
defined when building the regular vDSO *kernel* code.

> > Fixes: 021d23428bdb ("RISC-V: build: Allow LTO to be selected")
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
> > ---
> >  arch/riscv/kernel/vdso/Makefile | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> > 
> > diff --git a/arch/riscv/kernel/vdso/Makefile b/arch/riscv/kernel/vdso/Makefile
> > index a842dc034571..43ee881f6c6f 100644
> > --- a/arch/riscv/kernel/vdso/Makefile
> > +++ b/arch/riscv/kernel/vdso/Makefile
> > @@ -69,9 +69,9 @@ CPPFLAGS_$(vdso_lds) += -DHAS_VGETTIMEOFDAY
> >  endif
> >  
> >  # Disable -pg to prevent insert call site
> > -CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
> > -CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
> > -CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS)
> > +CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
> > +CFLAGS_REMOVE_getrandom.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
> > +CFLAGS_REMOVE_hwprobe.o = $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_LTO)
> >  
> >  # Force dependency
> >  $(obj)/$(vdso_o): $(obj)/$(vdso_so)
> > 
> > -- 
> > 2.55.0
> > 
> 
> -- 
> Cheers,
> Nathan

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