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From: Bruce Richardson <bruce.richardson@intel.com>
To: Neil Horman <nhorman@tuxdriver.com>
Cc: dev@dpdk.org, Michael Qiu <qdy220091330@gmail.com>
Subject: Re: [dpdk-dev] [PATCH v3] Fix two compile issues with i686 platform
Date: Fri, 5 Dec 2014 15:02:33 +0000
Message-ID: <20141205150233.GA9704@bricha3-MOBL3> (raw)
In-Reply-To: <20141205142205.GB29245@hmsreliant.think-freely.org>

On Fri, Dec 05, 2014 at 09:22:05AM -0500, Neil Horman wrote:
> On Fri, Dec 05, 2014 at 04:31:47PM +0800, Chao Zhu wrote:
> > 
> > On 2014/12/4 17:12, Michael Qiu wrote:
> > >lib/librte_eal/linuxapp/eal/eal_memory.c:324:4: error: comparison
> > >is always false due to limited range of data type [-Werror=type-limits]
> > >     || (hugepage_sz == RTE_PGSIZE_16G)) {
> > >     ^
> > >cc1: all warnings being treated as errors
> > >
> > >lib/librte_eal/linuxapp/eal/eal.c(461): error #2259: non-pointer
> > >conversion from "long long" to "void *" may lose significant bits
> > >    RTE_PTR_ALIGN_CEIL((uintptr_t)addr, RTE_PGSIZE_16M);
> > >
> > >This was introuduced by commit b77b5639:
> > >         mem: add huge page sizes for IBM Power
> > >
> > >The root cause is that size_t and uintptr_t are 32-bit in i686
> > >platform, but RTE_PGSIZE_16M and RTE_PGSIZE_16G are always 64-bit.
> > >
> > >Define RTE_PGSIZE_16G only in 64 bit platform to avoid
> > >this issue.
> > >
> > >Signed-off-by: Michael Qiu <michael.qiu@intel.com>
> > >---
> > >  v3 ---> v2
> > >	Change RTE_PGSIZE_16G from ULL to UL
> > >	to keep all entries consistent
> > >
> > >  V2 ---> v1
> > >	Change two type entries to one, and
> > >	leave RTE_PGSIZE_16G only valid for
> > >	64-bit platform
> > >
> NACK, this is the wrong way to fix this problem.  Pagesizes are independent of
> architecutre.  While a system can't have a hugepage size that exceeds its
> virtual address limit, theres no need to do per-architecture special casing of
> page sizes here.  Instead of littering the code with ifdef RTE_ARCH_64
> everytime you want to check a page size, just convert the size_t to a uint64_t
> and you can allow all of the enumerated page types on all architecutres, and
> save yourself some ifdeffing in the process.
> 
> Neil

While I get your point, I find it distasteful to use a uint64_t for memory sizes,
when there is the size_t type defined for that particular purpose.
However, I suppose that reducing the number of #ifdefs compared to using the
"correct" datatypes for objects is a more practical optino - however distastful
I find it.

/Bruce

  reply	other threads:[~2014-12-05 15:02 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1417329845-7482-1-git-send-email-michael.qiu@intel.com>
     [not found] ` <1417594223-2573-1-git-send-email-michael.qiu@intel.com>
2014-12-03 11:32   ` [dpdk-dev] [PATCH v2] " Qiu, Michael
2014-12-03 15:40   ` Bruce Richardson
2014-12-04  2:49     ` Qiu, Michael
2014-12-04  9:03       ` Thomas Monjalon
2014-12-04 10:21         ` Qiu, Michael
2014-12-04  9:12           ` [dpdk-dev] [PATCH v3] " Michael Qiu
2014-12-05  6:56             ` Qiu, Michael
2014-12-05  7:04               ` Chao Zhu
2014-12-05  8:31             ` Chao Zhu
2014-12-05 14:22               ` Neil Horman
2014-12-05 15:02                 ` Bruce Richardson [this message]
2014-12-05 15:24                   ` Neil Horman
2014-12-08  2:46                     ` Qiu, Michael
2014-12-08  2:59                       ` Neil Horman
2014-12-08  3:37                         ` Qiu, Michael
2014-12-08  4:57                           ` Qiu, Michael
2014-12-08 11:37                           ` Neil Horman
2014-12-08 11:50                             ` Thomas Monjalon
2014-12-08 14:59                             ` Qiu, Michael
2014-12-10 10:46             ` [dpdk-dev] [PATCH 0/2 v4] " Michael Qiu
2014-12-10 10:46               ` [dpdk-dev] [PATCH 1/2 v4] Fix compile issue with hugepage_sz in 32-bit system Michael Qiu
2014-12-10 10:46               ` [dpdk-dev] [PATCH 2/2] Fix compile issue of eal with icc compile Michael Qiu
2014-12-11  0:56               ` [dpdk-dev] [PATCH 0/2 v4] Fix two compile issues with i686 platform Thomas Monjalon
2014-12-11 13:25                 ` Neil Horman
2014-12-11 15:28                   ` Qiu, Michael
2014-12-11 21:21                     ` Thomas Monjalon
2014-12-12 11:38                       ` Neil Horman
2014-12-12 15:09                         ` Thomas Monjalon
2014-12-12 15:29                           ` Neil Horman

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