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Date: Wed, 30 Apr 2014 13:22:51 +0400 From: Alexey Charkov <alchark@...il.com> To: David Laight <David.Laight@...lab.com> Cc: Jan Moskyto Matejka <mq@...e.cz>, Roger Luethi <rl@...lgate.ch>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] net: via-rhine: fix compiler warning 2014-04-30 12:49 GMT+04:00 David Laight <David.Laight@...lab.com>: > From: Jan Moskyto Matejka >> Fixed different size cast warning: >> >> drivers/net/ethernet/via/via-rhine.c: In function rhine_init_one_platform: >> drivers/net/ethernet/via/via-rhine.c:1132:13: warning: cast from pointer to integer of different >> size [-Wpointer-to-int-cast] >> revision = (u32)match->data; >> ^ >> >> That code was added in commit 2d283862dc62daead9db0dc89cd0d0351e91f765 >> ("net: via-rhine: add OF bus binding"). > ... >> diff --git a/drivers/net/ethernet/via/via-rhine.c b/drivers/net/ethernet/via/via-rhine.c >> index 4fa9201..76d18e0 100644 >> --- a/drivers/net/ethernet/via/via-rhine.c >> +++ b/drivers/net/ethernet/via/via-rhine.c >> @@ -288,7 +288,7 @@ MODULE_DEVICE_TABLE(pci, rhine_pci_tbl); >> * (for quirks etc.) >> */ >> static struct of_device_id rhine_of_tbl[] = { >> - { .compatible = "via,vt8500-rhine", .data = (void *)0x84 }, >> + { .compatible = "via,vt8500-rhine", .data = (u32 []) { 0x84 } }, >> { } /* terminate list */ >> }; >> MODULE_DEVICE_TABLE(of, rhine_of_tbl); >> @@ -1129,7 +1129,7 @@ static int rhine_init_one_platform(struct platform_device *pdev) >> if (!irq) >> return -EINVAL; >> >> - revision = (u32)match->data; >> + revision = *((u32 *) match->data); >> if (!revision) >> return -EINVAL; > > Both those casts look horrid. > I'm not entirely convinced that the first is valid C - It would have to be > something specific to C99 initialisers. > Casts like *(u32 *)foo are also likely to be bugs (esp. on BE systems) > so themselves start ringing alarm bells. > > So why not just: > revision = (unsigned long)match->data; > and add a comment that the 0x84 is the revision - #define ?? There is no particular reason why it should be u32 now - this is a leftover from the previous iteration of code where revision was a separate property in DT (sized u32). It actually mirrors the respective field in struct pci_dev, which is u8 - don't see any issue defining it as unsigned long (and also changing the definition in struct rhine_private). The comment that it's the revision is right above the match table (cut off in the patch) :) Jan, would you prefer to adjust your patch, or shall I send another one to change rp->revision and friends to unsigned long? Thanks a lot, Alexey -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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