From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Andrew Donnellan <ajd@linux.ibm.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
npiggin@gmail.com, dja@axtens.net
Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 06/15] powerpc/32: prepare for CONFIG_VMAP_STACK
Date: Fri, 18 Oct 2019 08:46:35 +0200 [thread overview]
Message-ID: <baff8ef3-a3c6-c6e2-732f-4d521d92140b@c-s.fr> (raw)
In-Reply-To: <d181b762-3e7b-7a0a-2505-54ead241456d@linux.ibm.com>
Le 17/10/2019 à 09:36, Andrew Donnellan a écrit :
> On 10/9/19 7:16 pm, Christophe Leroy wrote:
>> +#if defined(CONFIG_VMAP_STACK) && CONFIG_THREAD_SHIFT < PAGE_SHIFT
>> +#define THREAD_SHIFT PAGE_SHIFT
>> +#else
>> #define THREAD_SHIFT CONFIG_THREAD_SHIFT
>> +#endif
>>
>> #define THREAD_SIZE (1 << THREAD_SHIFT)
>>
>
> Looking at 64-bit book3s: with 64K pages, this results in a THREAD_SIZE
> that's too large for immediate mode arithmetic operations, which is
> annoying. Hmm.
>
Which operation are you thinking about ?
For instance, 'addi' can't be used anymore, but 'addis' can.
Christophe
next prev parent reply other threads:[~2019-10-18 6:48 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-10 9:16 [PATCH v3 00/15] Enable CONFIG_VMAP_STACK on PPC32 Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 01/15] powerpc/32: replace MTMSRD() by mtmsr Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 02/15] powerpc/32: Add EXCEPTION_PROLOG_0 in head_32.h Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 03/15] powerpc/32: save DEAR/DAR before calling handle_page_fault Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 04/15] powerpc/32: move MSR_PR test into EXCEPTION_PROLOG_0 Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 05/15] powerpc/32: add a macro to get and/or save DAR and DSISR on stack Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 06/15] powerpc/32: prepare for CONFIG_VMAP_STACK Christophe Leroy
2019-10-17 7:36 ` Andrew Donnellan
2019-10-18 6:46 ` Christophe Leroy [this message]
2019-10-18 7:09 ` Andrew Donnellan
2019-09-10 9:16 ` [PATCH v3 07/15] powerpc: align stack to 2 * THREAD_SIZE with VMAP_STACK Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 08/15] powerpc/32: Add early stack overflow detection with VMAP stack Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 09/15] powerpc/8xx: Use alternative scratch registers in DTLB miss handler Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 10/15] powerpc/8xx: drop exception entries for non-existing exceptions Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 11/15] powerpc/8xx: move DataStoreTLBMiss perf handler Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 12/15] powerpc/8xx: split breakpoint exception Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 13/15] powerpc/8xx: Enable CONFIG_VMAP_STACK Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 14/15] powerpc/32s: reorganise DSI handler Christophe Leroy
2019-09-10 9:16 ` [PATCH v3 15/15] powerpc/32s: Activate CONFIG_VMAP_STACK Christophe Leroy
2019-11-18 11:11 ` Michael Ellerman
2019-11-19 6:57 ` Michael Ellerman
2019-11-19 17:23 ` Christophe Leroy
2019-11-19 6:58 ` Michael Ellerman
2019-11-20 7:38 ` Christophe Leroy
2019-11-26 9:01 ` Christophe Leroy
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