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f5967101e9
People complained about ARCH_HWEIGHT_CFLAGS and how it throws a wrench
into kcov, lto, etc, experimentations.
Add asm versions for __sw_hweight{32,64}() and do explicit saving and
restoring of clobbered registers. This gets rid of the special calling
convention. We get to call those functions on !X86_FEATURE_POPCNT CPUs.
We still need to hardcode POPCNT and register operands as some old gas
versions which we support, do not know about POPCNT.
Btw, remove redundant REX prefix from 32-bit POPCNT because alternatives
can do padding now.
Suggested-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1464605787-20603-1-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
47 lines
1.0 KiB
C
47 lines
1.0 KiB
C
#include <linux/module.h>
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#include <asm/checksum.h>
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#include <asm/pgtable.h>
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#include <asm/desc.h>
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#include <asm/ftrace.h>
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#ifdef CONFIG_FUNCTION_TRACER
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/* mcount is defined in assembly */
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EXPORT_SYMBOL(mcount);
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#endif
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/*
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* Note, this is a prototype to get at the symbol for
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* the export, but dont use it from C code, it is used
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* by assembly code and is not using C calling convention!
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*/
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#ifndef CONFIG_X86_CMPXCHG64
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extern void cmpxchg8b_emu(void);
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EXPORT_SYMBOL(cmpxchg8b_emu);
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#endif
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/* Networking helper routines. */
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EXPORT_SYMBOL(csum_partial_copy_generic);
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EXPORT_SYMBOL(__get_user_1);
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EXPORT_SYMBOL(__get_user_2);
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EXPORT_SYMBOL(__get_user_4);
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EXPORT_SYMBOL(__get_user_8);
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EXPORT_SYMBOL(__put_user_1);
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EXPORT_SYMBOL(__put_user_2);
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EXPORT_SYMBOL(__put_user_4);
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EXPORT_SYMBOL(__put_user_8);
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EXPORT_SYMBOL(strstr);
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EXPORT_SYMBOL(csum_partial);
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EXPORT_SYMBOL(empty_zero_page);
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#ifdef CONFIG_PREEMPT
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EXPORT_SYMBOL(___preempt_schedule);
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EXPORT_SYMBOL(___preempt_schedule_notrace);
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#endif
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EXPORT_SYMBOL(__sw_hweight32);
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