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Miscellaneous fixes:

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- Fix a NOP-patching bug that resulted in valid
    but suboptimal NOP sequences in certain cases.
 
  - Fix build warnings related to fall-through control flow
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-urgent-2024-05-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:

 - Fix a NOP-patching bug that resulted in valid but suboptimal
   NOP sequences in certain cases

 - Fix build warnings related to fall-through control flow

* tag 'x86-urgent-2024-05-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/alternatives: Use the correct length when optimizing NOPs
  x86/boot: Address clang -Wimplicit-fallthrough in vsprintf()
  x86/boot: Add a fallthrough annotation
This commit is contained in:
Linus Torvalds 2024-05-19 11:42:29 -07:00
commit 41c14f1ac8
3 changed files with 5 additions and 1 deletions
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1
arch/x86/boot/Makefile
View File

@ -56,6 +56,7 @@ KBUILD_CFLAGS := $(REALMODE_CFLAGS) -D_SETUP
KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__
KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
KBUILD_CFLAGS += $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
$(obj)/bzImage: asflags-y := $(SVGA_MODE)

3
arch/x86/boot/printf.c
View File

@ -246,6 +246,7 @@ int vsprintf(char *buf, const char *fmt, va_list args)
case 'x':
flags |= SMALL;
fallthrough;
case 'X':
base = 16;
break;
@ -253,6 +254,8 @@ int vsprintf(char *buf, const char *fmt, va_list args)
case 'd':
case 'i':
flags |= SIGN;
break;
case 'u':
break;

2
arch/x86/kernel/alternative.c
View File

@ -372,7 +372,7 @@ static void __apply_relocation(u8 *buf, const u8 * const instr, size_t instrlen,
void apply_relocation(u8 *buf, const u8 * const instr, size_t instrlen, u8 *repl, size_t repl_len)
{
__apply_relocation(buf, instr, instrlen, repl, repl_len);
optimize_nops(instr, buf, repl_len);
optimize_nops(instr, buf, instrlen);
}
/* Low-level backend functions usable from alternative code replacements. */