scripts/coccinelle: Find PTR_ERR() to %pe candidates

Add a new Coccinelle script to identify places where PTR_ERR() is used
in print functions and suggest using the %pe format specifier instead.

For printing error pointers (i.e., a pointer for which IS_ERR() is true)
%pe will print a symbolic error name (e.g,. -EINVAL), opposed to the raw
errno (e.g,. -22) produced by PTR_ERR().
It also makes the code cleaner by saving a redundant call to PTR_ERR().

The script supports context, report, and org modes.

Example transformation:
    printk("Error: %ld\n", PTR_ERR(ptr));  // Before
    printk("Error: %pe\n", ptr);          // After

Signed-off-by: Gal Pressman <gal@nvidia.com>
Reviewed-by: Alexei Lazar <alazar@nvidia.com>
Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/1758192227-701925-2-git-send-email-tariqt@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

0 files changed, 0 insertions, 0 deletions