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lib/test_hash.c: fix warning in preprocessor symbol evaluation

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Some versions of gcc don't like tests for the value of an undefined
preprocessor symbol, even in the #else branch of an #ifndef:

    lib/test_hash.c:224:7: warning: "HAVE_ARCH__HASH_32" is not defined [-Wundef]
     #elif HAVE_ARCH__HASH_32 != 1
	   ^
    lib/test_hash.c:229:7: warning: "HAVE_ARCH_HASH_32" is not defined [-Wundef]
     #elif HAVE_ARCH_HASH_32 != 1
	   ^
    lib/test_hash.c:234:7: warning: "HAVE_ARCH_HASH_64" is not defined [-Wundef]
     #elif HAVE_ARCH_HASH_64 != 1
	   ^

Seen with gcc 4.9, not seen with 4.1.2.

Change the logic to only check the value inside an #ifdef to fix this.

Fixes: 468a942852 ("<linux/hash.h>: Add support for architecture-specific functions")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>
Acked-by: George Spelvin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Geert Uytterhoeven authored and Linus Torvalds committed 2016-09-01 17:52:01 -07:00
1 parent ed76b7a131
commit e6173ba42b
1 file changed
+15 -9
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lib/test_hash.c
+15 -9
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@@ -219,21 +219,27 @@ test_hash_init(void)
}
/* Issue notices about skipped tests. */
#ifndef HAVE_ARCH__HASH_32
pr_info("__hash_32() has no arch implementation to test.");
#elif HAVE_ARCH__HASH_32 != 1
#ifdef HAVE_ARCH__HASH_32
#if HAVE_ARCH__HASH_32 != 1
pr_info("__hash_32() is arch-specific; not compared to generic.");
#endif
#ifndef HAVE_ARCH_HASH_32
pr_info("hash_32() has no arch implementation to test.");
#elif HAVE_ARCH_HASH_32 != 1
#else
pr_info("__hash_32() has no arch implementation to test.");
#endif
#ifdef HAVE_ARCH_HASH_32
#if HAVE_ARCH_HASH_32 != 1
pr_info("hash_32() is arch-specific; not compared to generic.");
#endif
#ifndef HAVE_ARCH_HASH_64
pr_info("hash_64() has no arch implementation to test.");
#elif HAVE_ARCH_HASH_64 != 1
#else
pr_info("hash_32() has no arch implementation to test.");
#endif
#ifdef HAVE_ARCH_HASH_64
#if HAVE_ARCH_HASH_64 != 1
pr_info("hash_64() is arch-specific; not compared to generic.");
#endif
#else
pr_info("hash_64() has no arch implementation to test.");
#endif
pr_notice("%u tests passed.", tests);