+ riscv-fix-vmallc_start-definition.patch added to mm-hotfixes-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: riscv: fix VMALLOC_START definition
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     riscv-fix-vmallc_start-definition.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/riscv-fix-vmallc_start-definition.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Baoquan He <bhe@redhat.com>
Subject: riscv: fix VMALLOC_START definition
Date: Tue, 5 Dec 2023 11:02:55 +0800

When below config items are set, compiler complained:

--------------------
CONFIG_CRASH_CORE=y
CONFIG_KEXEC_CORE=y
CONFIG_CRASH_DUMP=y
......
-----------------------

-------------------------------------------------------------------
arch/riscv/kernel/crash_core.c: In function 'arch_crash_save_vmcoreinfo':
arch/riscv/kernel/crash_core.c:11:58: warning: format '%lx' expects argument of type 'long unsigned int', but argument 2 has type 'int' [-Wformat=]
11 |         vmcoreinfo_append_str("NUMBER(VMALLOC_START)=0x%lx\n", VMALLOC_START);
   |                                                        ~~^
   |                                                          |
   |                                                          long unsigned int
   |                                                        %x
----------------------------------------------------------------------

This is because on riscv macro VMALLOC_START has different type when
CONFIG_MMU is set or unset.

arch/riscv/include/asm/pgtable.h:
--------------------------------------------------

Changing it to _AC(0, UL) in case CONFIG_MMU=n can fix the warning.

Link: https://lkml.kernel.org/r/ZW7OsX4zQRA3mO4+@MiWiFi-R3L-srv
Signed-off-by: Baoquan He <bhe@redhat.com>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Eric DeVolder <eric_devolder@yahoo.com>
Cc: Ignat Korchagin <ignat@cloudflare.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 arch/riscv/include/asm/pgtable.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/riscv/include/asm/pgtable.h~riscv-fix-vmallc_start-definition
+++ a/arch/riscv/include/asm/pgtable.h
@@ -899,7 +899,7 @@ static inline pte_t pte_swp_clear_exclus
 #define PAGE_KERNEL		__pgprot(0)
 #define swapper_pg_dir		NULL
 #define TASK_SIZE		0xffffffffUL
-#define VMALLOC_START		0
+#define VMALLOC_START		_AC(0, UL)
 #define VMALLOC_END		TASK_SIZE
 
 #endif /* !CONFIG_MMU */
_

Patches currently in -mm which might be from bhe@redhat.com are

drivers-base-cpu-crash-data-showing-should-depends-on-kexec_core.patch
kernel-kconfigkexec-drop-select-of-kexec-for-crash_dump.patch
kexec_core-change-dependency-of-object-files.patch
kexec-drop-dependency-on-arch_supports_kexec-from-crash_dump-fix-1.patch
kexec-drop-dependency-on-arch_supports_kexec-from-crash_dump-fix-2.patch
riscv-fix-vmallc_start-definition.patch
resource-add-walk_system_ram_res_rev.patch
kexec_file-load-kernel-at-top-of-system-ram-if-required.patch
kexec_file-add-kexec_file-flag-to-control-debug-printing.patch
kexec_file-print-out-debugging-message-if-required.patch
kexec_file-x86-print-out-debugging-message-if-required.patch
kexec_file-arm64-print-out-debugging-message-if-required.patch
kexec_file-ricv-print-out-debugging-message-if-required.patch
kexec_file-power-print-out-debugging-message-if-required.patch
kexec_file-parisc-print-out-debugging-message-if-required.patch
riscv-kexec-fix-the-ifdeffery-for-aflags_kexec_relocateo.patch