From: Ilya Yanok <yanok@emcraft.com>
To: linuxppc-dev@ozlabs.org
Cc: dzu@denx.de, wd@denx.de
Subject: [RFC PATCH] Support for big page sizes on 44x
Date: Thu, 11 Sep 2008 01:53:05 +0400 [thread overview]
Message-ID: <1221083587-8091-1-git-send-email-yanok@emcraft.com> (raw)
This adds support for selecting page size on PPC 44x.
However there are still number of problems:
1. We can't use default PKMAP_BASE definition with 64KB/256KB pages so we
change it. Not sure that it's optimal. Then redefined PKMAP_BASE is not
aligned on (1<<PMD_SHIFT), don't know if it is really bad.
2. with 16KB/64KB/256KB pages WARN_ON(!pmd_none(*pmd)) is triggered inside
dma_alloc_init() function. Not sure if it is really bad.
3. with 256KB pages ENTRIES_PER_PAGEPAGE in mm/shem.c become zero.
Second patch tries to address this issue.
4. Ugly ppc_page_asm.h file. I'd prefer to see these defines calculated
instead of being hardcoded but PTE_SHIFT and PMD_SHIFT are declared
inside #ifndef __ASSEMBLY__. Don't know why.
We would appreciate any comment.
next reply other threads:[~2008-09-10 21:53 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-10 21:53 Ilya Yanok [this message]
2008-09-10 21:53 ` [PATCH] powerpc: add support for PAGE_SIZEs greater than 4KB for Ilya Yanok
2008-09-11 16:57 ` prodyut hazarika
2008-09-11 18:15 ` Re[2]: " Yuri Tikhonov
2008-09-11 20:09 ` Josh Boyer
2008-09-11 23:38 ` Ilya Yanok
2008-09-12 0:47 ` Josh Boyer
2008-09-11 18:28 ` Ilya Yanok
2008-09-11 18:38 ` prodyut hazarika
2008-09-11 22:44 ` Ilya Yanok
2008-09-11 23:52 ` Re[2]: " Yuri Tikhonov
2008-09-11 18:53 ` prodyut hazarika
2008-09-11 21:51 ` Ilya Yanok
2008-09-13 17:49 ` Benjamin Herrenschmidt
2008-09-13 23:37 ` Josh Boyer
2008-09-11 22:37 ` prodyut hazarika
2008-09-11 23:20 ` Re[2]: " Yuri Tikhonov
2008-09-12 3:48 ` David Gibson
2008-09-13 17:46 ` Benjamin Herrenschmidt
2008-09-26 23:43 ` Ilya Yanok
2008-09-26 23:35 ` Ilya Yanok
2008-09-29 2:58 ` David Gibson
2008-09-10 21:53 ` [PATCH] mm: fix ENTRIES_PER_PAGEPAGE overflow with 256KB pages Ilya Yanok
2008-09-12 3:50 ` David Gibson
2008-09-12 5:29 ` prodyut hazarika
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