[PATCH v2 02/11] x86/paravirt: remove clobbers parameter from paravirt patch functions

Juergen Gross
2018-08-13T07:37:30Z

The clobbers parameter from paravirt_patch_default() et al isn't used
any longer. Remove it.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
arch/x86/include/asm/paravirt_types.h | 7 +++----
arch/x86/kernel/alternative.c | 2 +-
arch/x86/kernel/paravirt.c | 14 +++++---------
arch/x86/kernel/paravirt_patch_32.c | 5 ++---
arch/x86/kernel/paravirt_patch_64.c | 5 ++---
arch/x86/kernel/vsmp_64.c | 6 +++---
6 files changed, 16 insertions(+), 23 deletions(-)

diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index 036b2f88f105..f6e24e78633b 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -84,7 +84,7 @@ struct pv_init_ops {
* the number of bytes of code generated, as we nop pad the
* rest in generic code.
*/
- unsigned (*patch)(u8 type, u16 clobber, void *insnbuf,
+ unsigned (*patch)(u8 type, void *insnbuf,
unsigned long addr, unsigned len);
} __no_randomize_layout;

@@ -370,14 +370,13 @@ extern struct pv_lock_ops pv_lock_ops;

unsigned paravirt_patch_ident_32(void *insnbuf, unsigned len);
unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len);
-unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
+unsigned paravirt_patch_default(u8 type, void *insnbuf,
unsigned long addr, unsigned len);

unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
const char *start, const char *end);

-unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
- unsigned long addr, unsigned len);
+unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len);

int paravirt_disable_iospace(void);

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index a481763a3776..9729cee11149 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -594,7 +594,7 @@ void __init_or_module apply_paravirt(struct paravirt_patch_site *start,
BUG_ON(p->len > MAX_PATCH_LEN);
/* prep the buffer with the original instructions */
memcpy(insnbuf, p->instr, p->len);
- used = pv_init_ops.patch(p->instrtype, p->clobbers, insnbuf,
+ used = pv_init_ops.patch(p->instrtype, insnbuf,
(unsigned long)p->instr, p->len);

BUG_ON(used > p->len);
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index ce560b916b1f..f0c462fe2808 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -80,10 +80,8 @@ struct branch {
u32 delta;
} __attribute__((packed));

-static unsigned paravirt_patch_call(void *insnbuf,
- const void *target, u16 tgt_clobbers,
- unsigned long addr, u16 site_clobbers,
- unsigned len)
+static unsigned paravirt_patch_call(void *insnbuf, const void *target,
+ unsigned long addr, unsigned len)
{
struct branch *b = insnbuf;
unsigned long delta = (unsigned long)target - (addr+5);
@@ -148,7 +146,7 @@ static void *get_call_destination(u8 type)
return *((void **)&tmpl + type);
}

-unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
+unsigned paravirt_patch_default(u8 type, void *insnbuf,
unsigned long addr, unsigned len)
{
void *opfunc = get_call_destination(type);
@@ -171,10 +169,8 @@ unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
/* If operation requires a jmp, then jmp */
ret = paravirt_patch_jmp(insnbuf, opfunc, addr, len);
else
- /* Otherwise call the function; assume target could
- clobber any caller-save reg */
- ret = paravirt_patch_call(insnbuf, opfunc, CLBR_ANY,
- addr, clobbers, len);
+ /* Otherwise call the function. */
+ ret = paravirt_patch_call(insnbuf, opfunc, addr, len);

return ret;
}
diff --git a/arch/x86/kernel/paravirt_patch_32.c b/arch/x86/kernel/paravirt_patch_32.c
index 758e69d72ebf..e5c3a438149e 100644
--- a/arch/x86/kernel/paravirt_patch_32.c
+++ b/arch/x86/kernel/paravirt_patch_32.c
@@ -30,8 +30,7 @@ unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
extern bool pv_is_native_spin_unlock(void);
extern bool pv_is_native_vcpu_is_preempted(void);

-unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
- unsigned long addr, unsigned len)
+unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
{
const unsigned char *start, *end;
unsigned ret;
@@ -70,7 +69,7 @@ unsigned native_patch(u8 type, u16 clobbers, void *ibuf,

default:
patch_default: __maybe_unused
- ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
+ ret = paravirt_patch_default(type, ibuf, addr, len);
break;

patch_site:
diff --git a/arch/x86/kernel/paravirt_patch_64.c b/arch/x86/kernel/paravirt_patch_64.c
index 9edadabf04f6..893ef87eb268 100644
--- a/arch/x86/kernel/paravirt_patch_64.c
+++ b/arch/x86/kernel/paravirt_patch_64.c
@@ -38,8 +38,7 @@ unsigned paravirt_patch_ident_64(void *insnbuf, unsigned len)
extern bool pv_is_native_spin_unlock(void);
extern bool pv_is_native_vcpu_is_preempted(void);

-unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
- unsigned long addr, unsigned len)
+unsigned native_patch(u8 type, void *ibuf, unsigned long addr, unsigned len)
{
const unsigned char *start, *end;
unsigned ret;
@@ -80,7 +79,7 @@ unsigned native_patch(u8 type, u16 clobbers, void *ibuf,

default:
patch_default: __maybe_unused
- ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
+ ret = paravirt_patch_default(type, ibuf, addr, len);
break;

patch_site:
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index 44685fb2a192..f194e5e1e95c 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -69,7 +69,7 @@ asmlinkage __visible void vsmp_irq_enable(void)
}
PV_CALLEE_SAVE_REGS_THUNK(vsmp_irq_enable);

-static unsigned __init vsmp_patch(u8 type, u16 clobbers, void *ibuf,
+static unsigned __init vsmp_patch(u8 type, void *ibuf,
unsigned long addr, unsigned len)
{
switch (type) {
@@ -77,9 +77,9 @@ static unsigned __init vsmp_patch(u8 type, u16 clobbers, void *ibuf,
case PARAVIRT_PATCH(pv_irq_ops.irq_disable):
case PARAVIRT_PATCH(pv_irq_ops.save_fl):
case PARAVIRT_PATCH(pv_irq_ops.restore_fl):
- return paravirt_patch_default(type, clobbers, ibuf, addr, len);
+ return paravirt_patch_default(type, ibuf, addr, len);
default:
- return native_patch(type, clobbers, ibuf, addr, len);
+ return native_patch(type, ibuf, addr, len);
}

}
--
2.13.7