genirq/proc: Fix missing CPU header in /proc/interrupts

irq_seq_show() must be idempotent since it may be called multiple times
to render the same record, e.g. when seq_file's buffer is exceeded. It
emits the CPU header behind the one-shot print_header flag, which the
first pass clears, so the header is lost with the discarded buffer.

This can be seen on large systems, such as 8g.48xl (192 CPUs) and
8i.96xl (384 CPUs) AWS instance types:

  $ head -1 /proc/interrupts
     9:          0          0 ...  0  GICv3  25 Level  vgic

Replace print_header with the position of the first record and include
the header whenever that record is emitted.

Fixes: 171cc0d9eed1 ("genirq/proc: Speed up /proc/interrupts iteration")
Signed-off-by: Haris Okanovic <harisokn@amazon.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Michael Kelley <mhklinux@outlook.com>
Reviewed-by: Radu Rendec <radu@rendec.net>
Link: https://patch.msgid.link/20260911-dev-harisokn-proc-interrupts-fix-b4-v1-1-f9ff208efcfa@amazon.com

0 files changed, 0 insertions, 0 deletions