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Re: glibc 2.21 - Machine maintainers, please test your machines.
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Torvald Riegel <triegel at redhat dot com>
- Cc: Andreas Schwab <schwab at suse dot de>, Chris Metcalf <cmetcalf at ezchip dot com>, "Carlos O'Donell" <carlos at redhat dot com>, GNU C Library <libc-alpha at sourceware dot org>, David Miller <davem at davemloft dot net>, Richard Henderson <rth at redhat dot com>, Mike Frysinger <vapier at gentoo dot org>, "Joseph S. Myers" <joseph at codesourcery dot com>, Kaz Kojima <kkojima at rr dot iij4u dot or dot jp>, Thomas Schwinge <thomas at codesourcery dot com>, Marcus Shawcroft <marcus dot shawcroft at linaro dot org>, Chung-Lin Tang <chunglin_tang at mentor dot com>, Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>, Andreas Krebbel <krebbel at linux dot vnet dot ibm dot com>
- Date: Mon, 26 Jan 2015 05:35:21 -0800
- Subject: Re: glibc 2.21 - Machine maintainers, please test your machines.
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On Mon, Jan 26, 2015 at 5:32 AM, Torvald Riegel <triegel@redhat.com> wrote:
> On Mon, 2015-01-26 at 05:25 -0800, H.J. Lu wrote:
>> On Mon, Jan 26, 2015 at 4:50 AM, Torvald Riegel <triegel@redhat.com> wrote:
>> > way? If so, then using __alignof__(sem_t) in Chris' patch would be good
>> > because then to_new_sem would resolve to a noop in x32 with your
>> > alignment change applied.
>>
>> I don't want a noop. I want compiler not to generate a noop at all.
>
> Yes, that's what I mean. Compiler should figure out that no conversion
> is necessary and not emit any code for this conversion.
>
If it is true, we should drop "&& !defined (_LP64)" in:
+#if __HAVE_64B_ATOMICS && !defined (_LP64)
+# define to_new_sem(s) ((struct new_sem *)(((uintptr_t)(s) + 4) & -8))
+#else
+# define to_new_sem(s) ((struct new_sem *)(s))
+#endif
--
H.J.
- References:
- glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.