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| author | Matt Turner <mattst88@gmail.com> | 2026-04-03 18:01:28 +0300 |
|---|---|---|
| committer | Magnus Lindholm <linmag7@gmail.com> | 2026-04-12 20:14:37 +0300 |
| commit | bd39fc81340aed5445c731eb391af9ac9a701658 (patch) | |
| tree | ba2d82497b3a883599b94def501ea978210a75d9 | |
| parent | 55b22075f7840ef48254886758976531fe146609 (diff) | |
| download | linux-bd39fc81340aed5445c731eb391af9ac9a701658.tar.xz | |
alpha: Define pgprot_modify to silence tautological comparison warnings
Alpha's pgprot_noncached, pgprot_writecombine, and pgprot_device are
all identity macros, so the generic pgprot_modify() produces
tautological self-comparisons that GCC warns about:
include/linux/pgtable.h:1701:25: warning: self-comparison always
evaluates to true [-Wtautological-compare]
Since all caching attributes are no-ops on Alpha, define
pgprot_modify() to simply return newprot.
Assisted-by: Claude:claude-opus-4-6
Signed-off-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://lore.kernel.org/r/20260403150128.488513-1-mattst88@gmail.com
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
| -rw-r--r-- | arch/alpha/include/asm/pgtable.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h index e9368c54be45..58870cad3351 100644 --- a/arch/alpha/include/asm/pgtable.h +++ b/arch/alpha/include/asm/pgtable.h @@ -127,6 +127,17 @@ struct vm_area_struct; #define pgprot_noncached(prot) (prot) /* + * All caching attribute macros are identity on Alpha, so the generic + * pgprot_modify() degenerates to tautological self-comparisons. + * Override it to just return newprot directly. + */ +#define pgprot_modify pgprot_modify +static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) +{ + return newprot; +} + +/* * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. */ |