From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 4/4] ARM: hwcap: disable HWCAP_SWP if the CPU advertises it has exclusives
Date: Fri, 04 Jul 2014 22:11:06 +0200 [thread overview]
Message-ID: <4606711.7KmFAGVNmG@wuerfel> (raw)
In-Reply-To: <E1X39Wr-0000ly-RF@rmk-PC.arm.linux.org.uk>
On Friday 04 July 2014 20:52:17 Russell King wrote:
> /*
> * HWCAP_TLS is available only on 1136 r1p0 and later,
> * see also kuser_get_tls_init.
> */
> - if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
> + if (read_cpuid_part() == ARM_CPU_PART_ARM1136 &&
> + ((id >> 20) & 3) == 0) {
> elf_hwcap &= ~HWCAP_TLS;
> + return;
> + }
>
Would it make sense to tie this check to the ARMv6K architecture level?
I see that cpu_architecture currently reports the same value for plain
ARMv6 (1136r0) and for ARMv6K (1136r1+ or any other ARM11), but we already
distinguish them at compile time in a number of places and it seems you
make the exact same distinction here at runtime.
Arnd
next prev parent reply other threads:[~2014-07-04 20:11 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-04 19:51 [PATCH 0/4] ABI updates Russell King - ARM Linux
2014-07-04 19:52 ` [PATCH 1/4] ARM: alignment: save last kernel aligned fault location Russell King
2014-07-04 19:52 ` [PATCH 2/4] ARM: SWP emulation: always enable when SMP is enabled Russell King
2014-07-04 19:52 ` [PATCH 3/4] ARM: SWP emulation: only initialise on ARMv7 CPUs Russell King
2014-07-04 19:52 ` [PATCH 4/4] ARM: hwcap: disable HWCAP_SWP if the CPU advertises it has exclusives Russell King
2014-07-04 20:11 ` Arnd Bergmann [this message]
2014-07-04 20:51 ` Russell King - ARM Linux
2014-07-04 20:58 ` Arnd Bergmann
2014-07-04 21:48 ` Russell King - ARM Linux
2014-07-05 18:46 ` Arnd Bergmann
2014-07-07 11:02 ` Catalin Marinas
2014-07-07 11:17 ` Russell King - ARM Linux
2014-07-07 12:05 ` Catalin Marinas
2014-07-07 13:13 ` Russell King - ARM Linux
2014-07-07 13:46 ` Catalin Marinas
2014-07-07 15:31 ` Russell King - ARM Linux
2014-07-07 15:59 ` Catalin Marinas
2014-07-07 16:31 ` Russell King - ARM Linux
2014-07-07 17:50 ` Catalin Marinas
2014-07-07 9:34 ` Will Deacon
2014-07-07 9:41 ` Russell King - ARM Linux
2014-07-07 9:51 ` Will Deacon
2014-07-04 20:12 ` [PATCH 0/4] ABI updates Arnd Bergmann
2014-07-07 11:19 ` Tony Lindgren
2014-07-07 11:23 ` Russell King - ARM Linux
2014-07-07 13:23 ` Tony Lindgren
2014-07-07 13:52 ` Catalin Marinas
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