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runtime: fix linux/arm build

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notetsleep: nosplit stack overflow
        128	assumed on entry to notetsleep
        80	after notetsleep uses 48
        44	after runtime.futexsleep uses 36
        -12	after runtime.timediv uses 56

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/12049043
This commit is contained in:
Dmitriy Vyukov 2013-07-29 22:59:30 +04:00
parent ddc01d5b06
commit d91219e458
1 changed files with 6 additions and 4 deletions
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10
src/pkg/runtime/lock_futex.c
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@ -138,9 +138,11 @@ runtime·notesleep(Note *n)
#pragma textflag 7 #pragma textflag 7
static bool static bool
notetsleep(Note *n, int64 ns) notetsleep(Note *n, int64 ns, int64 deadline, int64 now)
{ {
int64 deadline, now; // Conceptually, deadline and now are local variables.
// They are passed as arguments so that the space for them
// does not count against our nosplit stack sequence.
if(ns < 0) { if(ns < 0) {
while(runtime·atomicload((uint32*)&n->key) == 0) while(runtime·atomicload((uint32*)&n->key) == 0)
@ -174,7 +176,7 @@ runtime·notetsleep(Note *n, int64 ns)
if(m->profilehz > 0) if(m->profilehz > 0)
runtime·setprof(false); runtime·setprof(false);
res = notetsleep(n, ns); res = notetsleep(n, ns, 0, 0);
if(m->profilehz > 0) if(m->profilehz > 0)
runtime·setprof(true); runtime·setprof(true);
return res; return res;
@ -192,7 +194,7 @@ runtime·notetsleepg(Note *n, int64 ns)
runtime·throw("notetsleepg on g0"); runtime·throw("notetsleepg on g0");
runtime·entersyscallblock(); runtime·entersyscallblock();
res = notetsleep(n, ns); res = notetsleep(n, ns, 0, 0);
runtime·exitsyscall(); runtime·exitsyscall();
return res; return res;
} }