Merge commit d8a09b3a0
from openzfs git (by Ryan Libby):
lua: avoid gcc -Wreturn-local-addr bug Avoid a bug with gcc's -Wreturn-local-addr warning with some obfuscation. In buggy versions of gcc, if a return value is an expression that involves the address of a local variable, and even if that address is legally converted to a non-pointer type, a warning may be emitted and the value of the address may be replaced with zero. Howerver, buggy versions don't emit the warning or replace the value when simply returning a local variable of non-pointer type. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90737 Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ryan Libby <rlibby@FreeBSD.org> Closes #11337
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@ -33,14 +33,16 @@
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#if defined (_KERNEL) && defined(__linux__)
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#include <asm/current.h>
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static intptr_t stack_remaining(void) {
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char local;
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return (intptr_t)(&local - (char *)current->stack);
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intptr_t local;
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local = (intptr_t)&local - (intptr_t)current->stack;
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return local;
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}
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#elif defined (_KERNEL) && defined(__FreeBSD__)
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#include <sys/pcpu.h>
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static intptr_t stack_remaining(void) {
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char local;
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return (intptr_t)(&local - (char *)curthread->td_kstack);
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intptr_t local;
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local = (intptr_t)&local - (intptr_t)curthread->td_kstack;
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return local;
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}
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#else
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static intptr_t stack_remaining(void) {
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