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Re: [PATCH 01/23] x86: Add feature_1 to tcbhead_t [BZ #22563]

On 05/08/2018 10:39 PM, H.J. Lu wrote:

diff --git a/sysdeps/i386/nptl/tls.h b/sysdeps/i386/nptl/tls.h
index 8ca0924692..c3a0edd253 100644
--- a/sysdeps/i386/nptl/tls.h
+++ b/sysdeps/i386/nptl/tls.h
@@ -50,6 +50,10 @@ typedef struct
    void *__private_tm[4];
    /* GCC split stack support.  */
    void *__private_ss;
+  /* Bit 0: IBT.
+     Bit 1: SHSTK.
+   */
+  unsigned int feature_1;
  } tcbhead_t;
It might be nicer to reuse __glibc_reserved1 for that (I think __ASSUME_PRIVATE_FUTEX is always defined these days), in case some extern tools hard-code the tcbhead_t layout. 

Thanks,
Florian
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