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parisc: Prevent ldil() to sign-extend into upper 32 bits

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Add some build time checks to prevent that the various usages of
	"ldil L%(TMPALIAS_MAP_START), %reg"
sign-extends into the upper 32 bits when building a 64-bit kernel.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2022-05-17 16:57:06 +02:00
parent c64c782e58
commit 44eeb9b567
1 changed files with 6 additions and 0 deletions
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6
arch/parisc/mm/init.c
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@ -555,6 +555,12 @@ void __init mem_init(void)
BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PGD);
#endif
#ifdef CONFIG_64BIT
/* avoid ldil_%L() asm statements to sign-extend into upper 32-bits */
BUILD_BUG_ON(__PAGE_OFFSET >= 0x80000000);
BUILD_BUG_ON(TMPALIAS_MAP_START >= 0x80000000);
#endif
high_memory = __va((max_pfn << PAGE_SHIFT));
set_max_mapnr(max_low_pfn);
memblock_free_all();