b92021b09d
We have CONFIG_SYMBOL_PREFIX, which three archs define to the string "_". But Al Viro broke this in "consolidate cond_syscall and SYSCALL_ALIAS declarations" (in linux-next), and he's not the first to do so. Using CONFIG_SYMBOL_PREFIX is awkward, since we usually just want to prefix it so something. So various places define helpers which are defined to nothing if CONFIG_SYMBOL_PREFIX isn't set: 1) include/asm-generic/unistd.h defines __SYMBOL_PREFIX. 2) include/asm-generic/vmlinux.lds.h defines VMLINUX_SYMBOL(sym) 3) include/linux/export.h defines MODULE_SYMBOL_PREFIX. 4) include/linux/kernel.h defines SYMBOL_PREFIX (which differs from #7) 5) kernel/modsign_certificate.S defines ASM_SYMBOL(sym) 6) scripts/modpost.c defines MODULE_SYMBOL_PREFIX 7) scripts/Makefile.lib defines SYMBOL_PREFIX on the commandline if CONFIG_SYMBOL_PREFIX is set, so that we have a non-string version for pasting. (arch/h8300/include/asm/linkage.h defines SYMBOL_NAME(), too). Let's solve this properly: 1) No more generic prefix, just CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX. 2) Make linux/export.h usable from asm. 3) Define VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR(). 4) Make everyone use them. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: James Hogan <james.hogan@imgtec.com> Tested-by: James Hogan <james.hogan@imgtec.com> (metag)
25 lines
633 B
C
25 lines
633 B
C
#include <uapi/asm-generic/unistd.h>
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#include <linux/export.h>
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/*
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* These are required system calls, we should
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* invert the logic eventually and let them
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* be selected by default.
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*/
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#if __BITS_PER_LONG == 32
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#define __ARCH_WANT_STAT64
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#define __ARCH_WANT_SYS_LLSEEK
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#endif
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/*
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* "Conditional" syscalls
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*
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* What we want is __attribute__((weak,alias("sys_ni_syscall"))),
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* but it doesn't work on all toolchains, so we just do it by hand
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*/
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#ifndef cond_syscall
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#define cond_syscall(x) asm(".weak\t" VMLINUX_SYMBOL_STR(x) "\n\t" \
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".set\t" VMLINUX_SYMBOL_STR(x) "," \
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VMLINUX_SYMBOL_STR(sys_ni_syscall))
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#endif
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