On 10/18/19 6:30 PM, Sudip Mukherjee wrote:
> The build of xtensa allmodconfig is giving a warning of:
> In function 'dsi_dump_dsidev_irqs':
> warning: the frame size of 1120 bytes is larger than 1024 bytes
>
> Allocate the memory for 'struct dsi_irq_stats' dynamically instead
> of assigning it in stack.
>
> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
> ---
> drivers/video/fbdev/omap2/omapfb/dss/dsi.c | 24 ++++++++++++++----------
> 1 file changed, 14 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/video/fbdev/omap2/omapfb/dss/dsi.c b/drivers/video/fbdev/omap2/omapfb/dss/dsi.c
> index d620376216e1..43402467bf40 100644
> --- a/drivers/video/fbdev/omap2/omapfb/dss/dsi.c
> +++ b/drivers/video/fbdev/omap2/omapfb/dss/dsi.c
> @@ -1536,22 +1536,25 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev,
> {
> struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
> unsigned long flags;
> - struct dsi_irq_stats stats;
> + struct dsi_irq_stats *stats;
>
> + stats = kmalloc(sizeof(*stats), GFP_KERNEL);
> + if (!stats)
> + return;
> spin_lock_irqsave(&dsi->irq_stats_lock, flags);
>
> - stats = dsi->irq_stats;
> + memcpy(stats, &dsi->irq_stats, sizeof(*stats));
"stats" copy is only needed for generating debugfs information.
We can probably reduce the stack usage and also simplify the driver
by just accessing dsi->irq_stats directly before cleaning it
(we would also need to extend coverage of spinlock but the code is
debug only so this should not be a problem).
Care to try this approach?
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
> memset(&dsi->irq_stats, 0, sizeof(dsi->irq_stats));
> dsi->irq_stats.last_reset = jiffies;
>
> spin_unlock_irqrestore(&dsi->irq_stats_lock, flags);
>
> seq_printf(s, "period %u ms\n",
> - jiffies_to_msecs(jiffies - stats.last_reset));
> + jiffies_to_msecs(jiffies - stats->last_reset));
>
> - seq_printf(s, "irqs %d\n", stats.irq_count);
> + seq_printf(s, "irqs %d\n", stats->irq_count);
> #define PIS(x) \
> - seq_printf(s, "%-20s %10d\n", #x, stats.dsi_irqs[ffs(DSI_IRQ_##x)-1]);
> + seq_printf(s, "%-20s %10d\n", #x, stats->dsi_irqs[ffs(DSI_IRQ_##x)-1]);
>
> seq_printf(s, "-- DSI%d interrupts --\n", dsi->module_id + 1);
> PIS(VC0);
> @@ -1575,10 +1578,10 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev,
>
> #define PIS(x) \
> seq_printf(s, "%-20s %10d %10d %10d %10d\n", #x, \
> - stats.vc_irqs[0][ffs(DSI_VC_IRQ_##x)-1], \
> - stats.vc_irqs[1][ffs(DSI_VC_IRQ_##x)-1], \
> - stats.vc_irqs[2][ffs(DSI_VC_IRQ_##x)-1], \
> - stats.vc_irqs[3][ffs(DSI_VC_IRQ_##x)-1]);
> + stats->vc_irqs[0][ffs(DSI_VC_IRQ_##x)-1], \
> + stats->vc_irqs[1][ffs(DSI_VC_IRQ_##x)-1], \
> + stats->vc_irqs[2][ffs(DSI_VC_IRQ_##x)-1], \
> + stats->vc_irqs[3][ffs(DSI_VC_IRQ_##x)-1]);
>
> seq_printf(s, "-- VC interrupts --\n");
> PIS(CS);
> @@ -1594,7 +1597,7 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev,
>
> #define PIS(x) \
> seq_printf(s, "%-20s %10d\n", #x, \
> - stats.cio_irqs[ffs(DSI_CIO_IRQ_##x)-1]);
> + stats->cio_irqs[ffs(DSI_CIO_IRQ_##x)-1]);
>
> seq_printf(s, "-- CIO interrupts --\n");
> PIS(ERRSYNCESC1);
> @@ -1618,6 +1621,7 @@ static void dsi_dump_dsidev_irqs(struct platform_device *dsidev,
> PIS(ULPSACTIVENOT_ALL0);
> PIS(ULPSACTIVENOT_ALL1);
> #undef PIS
> + kfree(stats);
> }
>
> static void dsi1_dump_irqs(struct seq_file *s)
