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parisc: Reduce size of the bug_table on 64-bit kernel by half

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[ Upstream commit 43266838515d30dc0c45d5c7e6e7edacee6cce92 ]

Enable GENERIC_BUG_RELATIVE_POINTERS which will store 32-bit relative
offsets to the bug address and the source file name instead of 64-bit
absolute addresses. This effectively reduces the size of the
bug_table[] array by half on 64-bit kernels.

Signed-off-by: Helge Deller <deller@gmx.de>
Stable-dep-of: 487635756198 ("parisc: Fix asm operand number out of range build error in bug table")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Helge Deller 2023-11-23 21:57:19 +01:00 committed by Greg Kroah-Hartman
parent 8479f5ca8b
commit f9e9e156db
2 changed files with 22 additions and 19 deletions
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7
arch/parisc/Kconfig
View File

@ -105,9 +105,12 @@ config ARCH_HAS_ILOG2_U64
default n
config GENERIC_BUG
bool
default y
def_bool y
depends on BUG
select GENERIC_BUG_RELATIVE_POINTERS if 64BIT
config GENERIC_BUG_RELATIVE_POINTERS
bool
config GENERIC_HWEIGHT
bool

34
arch/parisc/include/asm/bug.h
View File

@ -17,26 +17,27 @@
#define PARISC_BUG_BREAK_ASM "break 0x1f, 0x1fff"
#define PARISC_BUG_BREAK_INSN 0x03ffe01f /* PARISC_BUG_BREAK_ASM */
#if defined(CONFIG_64BIT)
#define ASM_WORD_INSN ".dword\t"
#ifdef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
# define __BUG_REL(val) ".word " __stringify(val) " - ."
#else
#define ASM_WORD_INSN ".word\t"
# define __BUG_REL(val) ".word " __stringify(val)
#endif
#ifdef CONFIG_DEBUG_BUGVERBOSE
#define BUG() \
do { \
asm volatile("\n" \
"1:\t" PARISC_BUG_BREAK_ASM "\n" \
"\t.pushsection __bug_table,\"a\"\n" \
"\t.align %4\n" \
"2:\t" ASM_WORD_INSN "1b, %c0\n" \
"\t.align 4\n" \
"2:\t" __BUG_REL(1b) "\n" \
"\t" __BUG_REL(%c0) "\n" \
"\t.short %1, %2\n" \
"\t.blockz %3-2*%4-2*2\n" \
"\t.blockz %3-2*4-2*2\n" \
"\t.popsection" \
: : "i" (__FILE__), "i" (__LINE__), \
"i" (0), "i" (sizeof(struct bug_entry)), \
"i" (sizeof(long)) ); \
"i" (0), "i" (sizeof(struct bug_entry)) ); \
unreachable(); \
} while(0)
@ -54,15 +55,15 @@
asm volatile("\n" \
"1:\t" PARISC_BUG_BREAK_ASM "\n" \
"\t.pushsection __bug_table,\"a\"\n" \
"\t.align %4\n" \
"2:\t" ASM_WORD_INSN "1b, %c0\n" \
"\t.align 4\n" \
"2:\t" __BUG_REL(1b) "\n" \
"\t" __BUG_REL(%c0) "\n" \
"\t.short %1, %2\n" \
"\t.blockz %3-2*%4-2*2\n" \
"\t.blockz %3-2*4-2*2\n" \
"\t.popsection" \
: : "i" (__FILE__), "i" (__LINE__), \
"i" (BUGFLAG_WARNING|(flags)), \
"i" (sizeof(struct bug_entry)), \
"i" (sizeof(long)) ); \
"i" (sizeof(struct bug_entry)) ); \
} while(0)
#else
#define __WARN_FLAGS(flags) \
@ -71,13 +72,12 @@
"1:\t" PARISC_BUG_BREAK_ASM "\n" \
"\t.pushsection __bug_table,\"a\"\n" \
"\t.align %2\n" \
"2:\t" ASM_WORD_INSN "1b\n" \
"2:\t" __BUG_REL(1b) "\n" \
"\t.short %0\n" \
"\t.blockz %1-%2-2\n" \
"\t.blockz %1-4-2\n" \
"\t.popsection" \
: : "i" (BUGFLAG_WARNING|(flags)), \
"i" (sizeof(struct bug_entry)), \
"i" (sizeof(long)) ); \
"i" (sizeof(struct bug_entry)) ); \
} while(0)
#endif