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author | Michael Ellerman <mpe@ellerman.id.au> | 2024-09-16 22:05:10 +1000 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2024-09-17 22:17:57 +1000 |
commit | 39190ac7cff1fd15135fa8e658030d9646fdb5f2 (patch) | |
tree | 9acf5bcf56ee6d30d78c400ef279167770f0d239 /arch/powerpc/sysdev | |
parent | b77d36bb9a3de774950ba712a0e47f9d33c6f6d7 (diff) |
powerpc/atomic: Use YZ constraints for DS-form instructions
The 'ld' and 'std' instructions require a 4-byte aligned displacement
because they are DS-form instructions. But the "m" asm constraint
doesn't enforce that.
That can lead to build errors if the compiler chooses a non-aligned
displacement, as seen with GCC 14:
/tmp/ccuSzwiR.s: Assembler messages:
/tmp/ccuSzwiR.s:2579: Error: operand out of domain (39 is not a multiple of 4)
make[5]: *** [scripts/Makefile.build:229: net/core/page_pool.o] Error 1
Dumping the generated assembler shows:
ld 8,39(8) # MEM[(const struct atomic64_t *)_29].counter, t
Use the YZ constraints to tell the compiler either to generate a DS-form
displacement, or use an X-form instruction, either of which prevents the
build error.
See commit 2d43cc701b96 ("powerpc/uaccess: Fix build errors seen with
GCC 13/14") for more details on the constraint letters.
Fixes: 9f0cbea0d8cc ("[POWERPC] Implement atomic{, 64}_{read, write}() without volatile")
Cc: stable@vger.kernel.org # v2.6.24+
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/all/20240913125302.0a06b4c7@canb.auug.org.au
Tested-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20240916120510.2017749-1-mpe@ellerman.id.au
Diffstat (limited to 'arch/powerpc/sysdev')
0 files changed, 0 insertions, 0 deletions