[PATCH] drivers/ata/sata_via.c - Eliminate "may be used uninitialized" warning - Kernel

This is a discussion on [PATCH] drivers/ata/sata_via.c - Eliminate "may be used uninitialized" warning - Kernel ; Called by svia_init_one with a temporary, so there's no effective code change. Signed-off-by: Joe Perches drivers/ata/sata_via.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c index 0d03f44..e01d2b1 100644 --- a/drivers/ata/sata_via.c +++ b/drivers/ata/sata_via.c @@ -406,10 +406,9 ...

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Thread: [PATCH] drivers/ata/sata_via.c - Eliminate "may be used uninitialized" warning

  1. [PATCH] drivers/ata/sata_via.c - Eliminate "may be used uninitialized" warning

    Called by svia_init_one with a temporary,
    so there's no effective code change.

    Signed-off-by: Joe Perches

    drivers/ata/sata_via.c | 4 ++--
    1 files changed, 2 insertions(+), 2 deletions(-)

    diff --git a/drivers/ata/sata_via.c b/drivers/ata/sata_via.c
    index 0d03f44..e01d2b1 100644
    --- a/drivers/ata/sata_via.c
    +++ b/drivers/ata/sata_via.c
    @@ -406,10 +406,9 @@ static int vt6420_prepare_host(struct pci_dev *pdev, struct ata_host **r_host)
    struct ata_host *host;
    int rc;

    - rc = ata_pci_prepare_sff_host(pdev, ppi, &host);
    + rc = ata_pci_prepare_sff_host(pdev, ppi, r_host);
    if (rc)
    return rc;
    - *r_host = host;

    rc = pcim_iomap_regions(pdev, 1 << 5, DRV_NAME);
    if (rc) {
    @@ -417,6 +416,7 @@ static int vt6420_prepare_host(struct pci_dev *pdev, struct ata_host **r_host)
    return rc;
    }

    + host = *r_host;
    host->ports[0]->ioaddr.scr_addr = svia_scr_addr(host->iomap[5], 0);
    host->ports[1]->ioaddr.scr_addr = svia_scr_addr(host->iomap[5], 1);



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  2. Re: [PATCH] drivers/ata/sata_via.c - Eliminate "may be used uninitialized" warning

    On Sun, Apr 06, 2008 at 02:45:20PM -0700, Joe Perches wrote:
    > Called by svia_init_one with a temporary,
    > so there's no effective code change.
    >...

    I'm not getting any warning here.

    Are you using an older gcc?

    cu
    Adrian

    --

    "Is there not promise of rain?" Ling Tan asked suddenly out
    of the darkness. There had been need of rain for many days.
    "Only a promise," Lao Er said.
    Pearl S. Buck - Dragon Seed

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  3. Re: [PATCH] drivers/ata/sata_via.c - Eliminate "may be used uninitialized" warning

    On Mon, 2008-04-07 at 00:50 +0300, Adrian Bunk wrote:
    > On Sun, Apr 06, 2008 at 02:45:20PM -0700, Joe Perches wrote:
    > > Called by svia_init_one with a temporary,
    > > so there's no effective code change.
    > I'm not getting any warning here.
    > Are you using an older gcc?

    Yes. Slightly less than 4.3.0

    $ gcc --version
    gcc (GCC) 4.2.2 20071128 (prerelease) (4.2.2-3.1mdv2008.0)

    $ git-show
    commit 6fdf5e67fe8d3c83500dad9acae985132c2459a3
    Merge: abd24df... e64a3cf...
    Author: Linus Torvalds
    Date: Fri Apr 4 15:09:44 2008 -0700

    Merge branch 'upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/ralf/upstream-linus

    * 'upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/ralf/upstream-linus:
    [MIPS] Make KGDB compile on UP
    [MIPS] Pb1200: Fix header breakage

    $ make defconfig
    []
    $ make clean
    []
    $ make drivers/ata/sata_via.o
    []
    CC drivers/ata/sata_via.o
    drivers/ata/sata_via.c: In function ‘svia_init_one’:
    drivers/ata/sata_via.c:504: warning: ‘host’ may be used uninitialized in this function


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  4. Re: [PATCH] drivers/ata/sata_via.c - Eliminate "may be used uninitialized" warning

    On Sun, Apr 06, 2008 at 03:00:07PM -0700, Joe Perches wrote:
    > On Mon, 2008-04-07 at 00:50 +0300, Adrian Bunk wrote:
    > > On Sun, Apr 06, 2008 at 02:45:20PM -0700, Joe Perches wrote:
    > > > Called by svia_init_one with a temporary,
    > > > so there's no effective code change.
    > > I'm not getting any warning here.
    > > Are you using an older gcc?
    >
    > Yes. Slightly less than 4.3.0
    >
    > $ gcc --version
    > gcc (GCC) 4.2.2 20071128 (prerelease) (4.2.2-3.1mdv2008.0)
    >...

    I've reproduced the warning with 4.2 but not with the 4.3 in Debian
    unstable.

    Jeff is the one to decide about this specific patch.

    Independent from this specific patch my opinion is that considering that
    we support 7 different release series of gcc aiming for a warning free
    compilation with the latest gcc is a good goal, but aiming for a warning
    free compilation with all supported gcc release series is not worth it
    (especially considering that patches that fix such warnings might even
    introduce new bugs).

    cu
    Adrian

    --

    "Is there not promise of rain?" Ling Tan asked suddenly out
    of the darkness. There had been need of rain for many days.
    "Only a promise," Lao Er said.
    Pearl S. Buck - Dragon Seed

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