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| author | Steven Whitehouse <swhiteho@redhat.com> | 2006-04-21 12:52:36 -0400 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2006-04-21 12:52:36 -0400 |
| commit | a748422ee45725e04e1d3792fa19dfa90ddfd116 (patch) | |
| tree | 978e12895468baaa9f7ab2747b9f7d50beaf1717 /arch/x86_64/kernel/process.c | |
| parent | c63e31c2cc1ec67372920b5e1aff8204d04dd172 (diff) | |
| parent | f4ffaa452e71495a06376f12f772342bc57051fc (diff) | |
| download | talos-obmc-linux-a748422ee45725e04e1d3792fa19dfa90ddfd116.tar.gz talos-obmc-linux-a748422ee45725e04e1d3792fa19dfa90ddfd116.zip | |
Merge branch 'master'
Diffstat (limited to 'arch/x86_64/kernel/process.c')
| -rw-r--r-- | arch/x86_64/kernel/process.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/arch/x86_64/kernel/process.c b/arch/x86_64/kernel/process.c index 70dd8e5c6889..fb903e65e079 100644 --- a/arch/x86_64/kernel/process.c +++ b/arch/x86_64/kernel/process.c @@ -575,8 +575,10 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p) prev->userrsp = read_pda(oldrsp); write_pda(oldrsp, next->userrsp); write_pda(pcurrent, next_p); + /* This must be here to ensure both math_state_restore() and - kernel_fpu_begin() work consistently. */ + kernel_fpu_begin() work consistently. + And the AMD workaround requires it to be after DS reload. */ unlazy_fpu(prev_p); write_pda(kernelstack, task_stack_page(next_p) + THREAD_SIZE - PDA_STACKOFFSET); @@ -781,10 +783,16 @@ long do_arch_prctl(struct task_struct *task, int code, unsigned long addr) } case ARCH_GET_GS: { unsigned long base; + unsigned gsindex; if (task->thread.gsindex == GS_TLS_SEL) base = read_32bit_tls(task, GS_TLS); - else if (doit) - rdmsrl(MSR_KERNEL_GS_BASE, base); + else if (doit) { + asm("movl %%gs,%0" : "=r" (gsindex)); + if (gsindex) + rdmsrl(MSR_KERNEL_GS_BASE, base); + else + base = task->thread.gs; + } else base = task->thread.gs; ret = put_user(base, (unsigned long __user *)addr); |
