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scripts/sorttable: Fix endianness handling in build-time mcount sort

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Kernel cross-compilation with BUILDTIME_MCOUNT_SORT produces zeroed
mcount values if the build-host endianness does not match the ELF
file endianness.

The mcount values array is converted from ELF file
endianness to build-host endianness during initialization in
fill_relocs()/fill_addrs(). Avoid extra conversion of these values during
weak-function zeroing; otherwise, they do not match nm-parsed addresses
and all mcount values are zeroed out.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Link: https://lore.kernel.org/patch.git-dca31444b0f1.your-ad-here.call-01743554658-ext-8692@work.hours
Fixes: ef378c3b8233 ("scripts/sorttable: Zero out weak functions in mcount_loc table")
Reported-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reported-by: Ihor Solodrai <ihor.solodrai@linux.dev>
Closes: https://lore.kernel.org/all/your-ad-here.call-01743522822-ext-4975@work.hours/
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Vasily Gorbik 2025-04-02 03:15:35 +02:00 committed by Steven Rostedt (Google)
parent ea8d7647f9
commit 023f124a64
1 changed files with 1 additions and 1 deletions
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2
scripts/sorttable.c
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@ -857,7 +857,7 @@ static void *sort_mcount_loc(void *arg)
for (void *ptr = vals; ptr < vals + size; ptr += long_size) {
uint64_t key;
key = long_size == 4 ? r((uint32_t *)ptr) : r8((uint64_t *)ptr);
key = long_size == 4 ? *(uint32_t *)ptr : *(uint64_t *)ptr;
if (!find_func(key)) {
if (long_size == 4)
*(uint32_t *)ptr = 0;