Re: [PATCH v1 3/3] spi: xilinx: Make num_chipselect 8-bit in the struct xspi_platform_data

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 





On 3/8/24 14:55, Andy Shevchenko wrote:
On Fri, Mar 08, 2024 at 02:48:04PM +0100, Michal Simek wrote:
On 3/8/24 14:31, Andy Shevchenko wrote:
On Fri, Mar 08, 2024 at 09:20:23AM +0100, Michal Simek wrote:
On 3/7/24 16:43, Andy Shevchenko wrote:

...

    struct xspi_platform_data {
-	u16 num_chipselect;
-	u8 bits_per_word;
-	struct spi_board_info *devices;
-	u8 num_devices;
    	bool force_irq;
+	u8 num_chipselect;
+	u8 bits_per_word;
+	u8 num_devices;

all above have 32bits. It means on 64bit cpu you have 32bit gap here.

+	struct spi_board_info *devices;

On all architectures? I mean do all 64-bit architecture ABIs _require_
the pointer to be aligned at 8-byte boundary? Even if so, the struct
itself can be aligned on 4-byte boundary.

I am not able to tell if toolchain enforce 8byte alignment by default/by
setup on all 64bit systems.
I am using pahole to check this which was recommended by Greg in past which
reports gap in the middle.

I see, thanks for explanation.

Yes, it's likely that in some cases it will be a gap on 64-bit platforms, but
after this patch no gap on 32-bit. Do you still want me to reshuffle that as
you suggested?

Yes I would prefer to do that change when you are doing cleanup.

M




[Index of Archives]     [Linux Kernel]     [Linux ARM (vger)]     [Linux ARM MSM]     [Linux Omap]     [Linux Arm]     [Linux Tegra]     [Fedora ARM]     [Linux for Samsung SOC]     [eCos]     [Linux Fastboot]     [Gcc Help]     [Git]     [DCCP]     [IETF Announce]     [Security]     [Linux MIPS]     [Yosemite Campsites]

  Powered by Linux